| 摘要 |
Embodiments of the present invention provide a method, a network node and a system for implementing point-to-multipoint multicast, which are applicable to P2MP multicast in a non-VPN scenario and can be deployed even when a PE device does not support mLDP. The method comprises: a network-side leaf node obtaining an mLDP label and FEC information of a user-side leaf node at a backward position through an mLDP mapping message of the user-side leaf node at the backward position, and then sending the mLDP mapping message containing the mLDP label and FEC information to a network-side root node at an upper position, and generating a forwarding table item; then the network-side root node querying or establishing RSVP P2MP LSP, and assigning a label value to the received FEC information; the forwarding table item of each network-side leaf node being associated with the label value of the FEC information; in addition, the network-side root node sending its own mLDP label and FEC information to the user-side leaf node at the upper position through the mLDP mapping message and associating its own mLDP label with the RSVP P2MP LSP and a label of the FEC information. Embodiments of the present invention are used to implement P2MP multicast. |
